You wan can go for Samsung S24D300 2ms Response Time. Good for gaming too.
Response time do not determine whether it is gaming or not. You cant tell the diff between 1ms, 2ms, 5ms, 8ms. Main difference between other monitors and XL series or VG248QE is 120hz and motion blurness reduction(benQ). With a higher refresh rate, and presuming your gpu can output 120fps, the gameplay for FPS is much smoother. Benq also gt motion blurness reduction technology to help out as well.
If not, normal Dell u2414h can suit ur needs le.